Add max_values option to stats

Author: Daan van der Kallen

binder/views.py

@@ -42,8 +42,8 @@
 # annotations: a list of annotation names that have to be applied to the queryset for the expr to work (optional),
 Stat = namedtuple(
 	'Stat',
-	['expr', 'filters', 'group_by', 'annotations', 'min_value'],
-	defaults=[{}, None, [], None],
+	['expr', 'filters', 'group_by', 'annotations', 'min_value', 'max_values'],
+	defaults=[{}, None, [], None, None],
 )
 
 
@@ -3041,6 +3041,11 @@ def _get_stat(self, request, queryset, stat, annotations, include_annotations):
 			else:
 				other = 0
 
+		elif stat.max_values is not None:
+			keys = sorted(value, key=lambda key: value[key], reverse=True)
+			for key in keys[stat.max_values:]:
+				other += value.pop(key)
+
 		return {
 			'value': value,
 			'other': other,